PMC271 datasheet(13/90 Pages) PADAUK

13 / 90 page

PMC271/PMS271 Series

8-bit ADC FPPA

TM 8-bit Controller

Page 13 of 90

PDK-DS-PMX271-EN_V105 – Dec. 18, 2018

Pin Description

Pin Name

Pin & Buffer

Type

Description

PA7 /

ST /

CMOS /

Analog

The functions of this pin can be:

(1) Bit 7 of port A. It can be configured as digital input or two-state output, with

pull-up resistor.

(2) X1 (input) when crystal oscillator is used.

If this pin is used for crystal oscillator, bit 7 of padier register must be programmed

“0” to avoid leakage current. This pin can be used to wake-up system during sleep

mode; however, wake-up function is also disabled if bit 7 of padier register is “0”.

PA6 /

ST /

CMOS /

Analog

The functions of this pin can be:

(1) Bit 6 of port A. It can be configured as digital input or two-state output, with

pull-up resistor.

(2) X2 (output) when crystal oscillator is used.

If this pin is used for crystal oscillator, bit 6 of padier register must be programmed

“0” to avoid leakage current. This pin can be used to wake-up system during sleep

mode; however, wake-up function is also disabled if bit 6 of padier register is “0”.

PA5 /

PRST#

ST /

CMOS

The functions of this pin can be:

(1) Bit 5 of port A. It can be configured as digital input or open-drain output pin.

Please notice that there is no pull-up resistor in this pin.

(2) Hardware reset.

This pin can be used to wake-up system during sleep mode; however, wake-up

function is also disabled if bit 5 of padier register is “0”.

Please

put 33Ω resistor in series to have high noise immunity when this pin is in

input mode.

PA4 /

AD6 /

COM4

ST /

CMOS /

Analog

The functions of this pin can be:

(1) Bit 4 of port A. It can be configured as digital input or two-state output, with

pull-up resistor.

(2) Channel 6 input of ADC.

(3) COM4 for LCD to provide (1/2 VDD) for LCD bias voltage.

If this pin acts as analog input, bit 4 of padier register must be programmed “0” to

avoid leakage current. This pin can be used to wake-up system during sleep

mode; however, wake-up function from this pin is also disabled when bit 4 of

padier register is “0”

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